Stoptech 127.37023L Disc Brake Rotor - Rear Left

StopTech Sport Rotor for Porsche Rear Left

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotor is a direct replacement disc for factory brake systems and stock calipers. Built for the rear left position, it adds a drilled and slotted surface to improve heat management, pad bite, and braking consistency on Porsche 944, 911, and 968 applications.

Part number 127.37023L is engineered for drivers who want a performance-focused rotor that still works with OE-style hardware and factory fitment. The coated finish helps resist corrosion, while the vented, high-carbon construction supports quieter operation and improved crack resistance in most applications.

Key Features

• Direct replacement disc brake rotor for factory brake systems and stock calipers
• Cross-drilled and slotted surface helps disperse heat and brake dust
• Improves pad bite and wet/dry braking response
• Black e-coating helps protect against corrosion
• High-carbon metallurgy in most applications for quieter operation and added durability
• Vented rotor design with straight vane construction
• Rear left fitment for select Porsche applications

Product Details

StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors are built as 1-piece replacement rotors for vehicles using factory calipers. This rotor measures 299.000 mm outside diameter, 23.900 mm nominal thickness, 22.000 mm discard thickness, and 100.300 mm overall height. Additional specifications include a 103.000 mm center hole diameter, 130.000 mm bolt circle diameter, 5 lug holes, and a vented rotor layout with straight vanes. Part number 127.37023L is a fitment-specific rear left rotor for Porsche 944, Porsche 911, and Porsche 968 models listed below.

Compatible With 1987-1991 Porsche 944, rear left; 1990-1994 Porsche 911, rear left, except Turbo Look; 1992-1995 Porsche 968, rear left, except Sport Pkg; and 1989 Porsche 911, rear left. This part number, 127.37023L, is a fitment-specific option for Porsche rear brake service where drilled and slotted rotor performance is desired.

What It Helps Address

• Brake fade from repeated heat buildup
• Pad glazing that can reduce braking response
• Brake dust accumulation on the rotor surface
• Corrosion on exposed rotor surfaces
• Reduced wet-weather braking consistency

Installation Notes and Tips

Install on the rear left position only and verify rotor dimensions, hub fitment, and caliper clearance before service. Because this rotor is a direct replacement for factory brake systems and stock calipers, it should be matched to the exact vehicle application and excluded package notes listed in the fitment data. Inspect pads, caliper condition, and brake fluid condition during rotor replacement for consistent results.

Quality Assurance

StopTech Sport rotors use a coated finish for corrosion resistance and high-carbon metallurgy in most applications for improved noise control and crack resistance. Part number 127.37023L is built to OE-style fitment standards for the listed Porsche rear left applications.